WFIWIW20 welded stainless steel pre-filters up to 14 bar
The WFIWIW20 welded pre-filter has an element made of sintered stainless steel 1.4404 in a welded design and traps solid particles larger than 20 µm. It withstands up to +150 °C.
The WFIWIW20 filter comes in 11 sizes (pipe ø 17.2 to 88.9 mm) with flows of 1,250 to 60,000 l/min at 7 bar; working pressure up to 14 bar. It is one of the stages of the WFIW filters — the housing is the same for all stages, only the element differs.
WFIWIW20 filters by size
The size determines the connection and the flow. Each size has its own PF range spare element.
| WFIWIW20 filters and spare elements by size | ||||||
|---|---|---|---|---|---|---|
| Filter | Connection | l/min at 7 bar | Nm³/h at 7 bar | Height A × diameter C | Weight | Spare element |
| WFIWIW20-005 | welding end ø 17.2 mm | 1,250 | 75 | 202 × 76.1 mm | 1.8 kg | PFIW20-005V |
| WFIWIW20-010 | welding end ø 21.3 mm | 2,500 | 150 | 240 × 76.1 mm | 2 kg | PFIW20-010V |
| WFIWIW20-018 | welding end ø 26.9 mm | 3,750 | 225 | 254 × 76.1 mm | 2 kg | PFIW20-018V |
| WFIWIW20-030 | welding end ø 33.7 mm | 5,250 | 315 | 280 × 88.9 mm | 3 kg | PFIW20-030V |
| WFIWIW20-047 | welding end ø 42.4 mm | 7,000 | 420 | 337 × 88.9 mm | 3 kg | PFIW20-047V |
| WFIWIW20-070 | welding end ø 48.3 mm | 10,000 | 600 | 376 × 114.3 mm | 4.3 kg | PFIW20-070V |
| WFIWIW20-094 | welding end ø 60.3 mm | 15,000 | 900 | 457 × 114.3 mm | 4.8 kg | PFIW20-094V |
| WFIWIW20-150 | welding end ø 60.3 mm | 21,000 | 1,260 | 583 × 114.3 mm | 5.3 kg | PFIW20-150V |
| WFIWIW20-175 | welding end ø 76.1 mm | 28,000 | 1,680 | 740 × 139.7 mm | 9 kg | PFIW20-175V |
| WFIWIW20-200 | welding end ø 88.9 mm | 40,000 | 2,400 | 1,004 × 139.7 mm | 10.8 kg | PFIW20-200V |
| WFIWIW20-240 | welding end ø 88.9 mm | 60,000 | 3,600 | 1,029 × 168.3 mm | 16.2 kg | PFIW20-240V |
The flows apply to a pressure of 7 bar and a temperature of +20 °C. Dimensions according to the manufacturer’s technical data sheet; you will find further data on the product page of each filter.
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When to use it
The welded pre-filter IW20 is the second design of the 20 µm stage alongside the sintered pre-filter I20 and goes in the same place in the filtration. It does not trap oil; the manufacturer does not state an ISO 8573-1 class for it.
The element is made entirely of stainless steel and, like the housing, withstands up to +150 °C.
Where to place it
At the start of the filtration or after the WFIWN25 coarse filter, before the WFIWN5 basic filter or the WFIWM fine pre-filter — instead of the WFIWI20 sintered pre-filter.
Flow by pressure
The catalogue flows apply to a pressure of 7 bar and a temperature of +20 °C. At a different pressure, they are multiplied by the correction factor: 1.88 at 14 bar.
| WFIWIW20 filter flow in l/min by pressure | ||||
|---|---|---|---|---|
| Size (connection) | 4 bar | 7 bar | 10 bar | 14 bar |
| 005 (welding end ø 17.2 mm) | 788 | 1,250 | 1,725 | 2,350 |
| 010 (welding end ø 21.3 mm) | 1,575 | 2,500 | 3,450 | 4,700 |
| 018 (welding end ø 26.9 mm) | 2,363 | 3,750 | 5,175 | 7,050 |
| 030 (welding end ø 33.7 mm) | 3,308 | 5,250 | 7,245 | 9,870 |
| 047 (welding end ø 42.4 mm) | 4,410 | 7,000 | 9,660 | 13,160 |
| 070 (welding end ø 48.3 mm) | 6,300 | 10,000 | 13,800 | 18,800 |
| 094 (welding end ø 60.3 mm) | 9,450 | 15,000 | 20,700 | 28,200 |
| 150 (welding end ø 60.3 mm) | 13,230 | 21,000 | 28,980 | 39,480 |
| 175 (welding end ø 76.1 mm) | 17,640 | 28,000 | 38,640 | 52,640 |
| 200 (welding end ø 88.9 mm) | 25,200 | 40,000 | 55,200 | 75,200 |
| 240 (welding end ø 88.9 mm) | 37,800 | 60,000 | 82,800 | 112,800 |
Element, condensate drainage and maintenance
A PF range element is fitted in the housing — for example, the PFIW20-010V for the WFIWIW20-010. The same element also fits the PFIW20-010, HPFIW20-010, WFITIW20-010, WFIFIW20-010 and WHFITIW20-010. Element working temperature +1.5 to +150 °C.
The filter is supplied with an element, without a condensate drain. For WFIW filters, the manufacturer offers the AOK20SS stainless steel float drain up to 20 bar and +65 °C and, for the head, the MDHI 50-K differential pressure gauge. The drain outlet in the bottom has a G 1/2" thread.
Replace the element at least once every 12 months. Once a year, also check the housing for visible damage.
Accessories for WFIWIW20 filters
MDHI 50-K gauge
Differential pressure gauge with connecting tubes; it shows how clogged the element is.
The same stage in other ranges
Stage IW20 also comes in the PFIW20 filters up to 14 bar, HPFIW20 filters up to 50 bar, WFITIW20 filters up to 14 bar, WFIFIW20 filters up to 14 bar and WHFITIW20 filters up to 50 bar. The elements are the same for all ranges.
Ventilek’s tip
Two designs of the 20 µm stage. The sintered pre-filter I20 and the welded IW20 have the same filtration rating and temperature up to +150 °C and go in the same place in the filtration.
- What filtration rating does the WFIWIW20 pre-filter have?
- The element traps particles larger than 20 µm. The manufacturer does not state an ISO 8573-1 class for it.
- How does it differ from the WFIWI20?
- Both elements are made of sintered stainless steel 1.4404 with a filtration rating of 20 µm; the IW20 element is of a welded design.
- When should the element be replaced?
- At least once every 12 months.
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With a ø 17.2 mm pipe connection and a flow of 1,250 l/min at 7 bar, the WFIWIW20-005 welded pre-filter traps solid contaminants larger than 20 µm and protects the finer stages...
With a ø 21.3 mm pipe connection and a flow of 2,500 l/min at 7 bar, the WFIWIW20-010 welded pre-filter traps solid contaminants larger than 20 µm and protects the finer stages...
With a ø 26.9 mm pipe connection and a flow of 3,750 l/min at 7 bar, the WFIWIW20-018 welded pre-filter traps solid contaminants larger than 20 µm and protects the finer stages...
With a ø 33.7 mm pipe connection and a flow of 5,250 l/min at 7 bar, the WFIWIW20-030 welded pre-filter traps solid contaminants larger than 20 µm and protects the finer stages...
With a ø 42.4 mm pipe connection and a flow of 7,000 l/min at 7 bar, the WFIWIW20-047 welded pre-filter traps solid contaminants larger than 20 µm and protects the finer stages...
With a ø 48.3 mm pipe connection and a flow of 10,000 l/min at 7 bar, the WFIWIW20-070 welded pre-filter traps solid contaminants larger than 20 µm and protects the finer stages...
With a ø 60.3 mm pipe connection and a flow of 15,000 l/min at 7 bar, the WFIWIW20-094 welded pre-filter traps solid contaminants larger than 20 µm and protects the finer stages...
With a ø 60.3 mm pipe connection and a flow of 21,000 l/min at 7 bar, the WFIWIW20-150 welded pre-filter traps solid contaminants larger than 20 µm and protects the finer stages...
With a ø 76.1 mm pipe connection and a flow of 28,000 l/min at 7 bar, the WFIWIW20-175 welded pre-filter traps solid contaminants larger than 20 µm and protects the finer stages...
With a ø 88.9 mm pipe connection and a flow of 40,000 l/min at 7 bar, the WFIWIW20-200 welded pre-filter traps solid contaminants larger than 20 µm and protects the finer stages...
With a ø 88.9 mm pipe connection and a flow of 60,000 l/min at 7 bar, the WFIWIW20-240 welded pre-filter traps solid contaminants larger than 20 µm and protects the finer stages...